These devices convert an electric signal into sound signals and vice versa, which will be audible to humans. These are input/output electronic components in the circuit diagram.

Microphone: converts sound or noise signal to an electrical signal.Earphone: converts an electrical signal to a sound signal.Loudspeaker: converts the electrical signal to sound signal but it will amplify version.Piezo- transducer: converts flow of electrical energy to sound signal.Bell converts the electrical signal to sound signal.Buzzer: converts an electrical signal to sound signal.

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